South Korean children and teens used smartphones for longer periods of time in 2023 than the year before, a report by a state-run think-tank showed Thursday. Children under the age of 10 used smartphones for an average of 1 hour and 15 minutes a day last year, marking an increase of 17.2 percent or 11 minutes, according to the report by the Korea Information Society Development Institute. The report surveyed 9,757 in...